Update viewer to 0.2.5 (#49)

* Check if navigator.xr exists in viewer app.js

* Add missing dependencies for viewer in setup.py

* Bump version to 0.2.5

Author: johnwason

tesseract_viewer_python/package.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <package format="3">
   <name>tesseract_viewer_python</name>
-  <version>0.2.4</version>
+  <version>0.2.5</version>
   <description>The tesseract_viewer_python package</description>
   <maintainer email="wason@wasontech.com">John Wason</maintainer>
   <license>Apache 2.0</license>

tesseract_viewer_python/setup.py

@@ -18,6 +18,6 @@
       packages=['tesseract_robotics_viewer','tesseract_robotics_viewer.resources'],
       package_data={'tesseract_robotics_viewer.resources':['static/index.html','static/app.js','geometries.json']},
 	  license='Apache-2.0',
-	  install_requires=['numpy','tesseract_robotics>=0.2.0','opencv-contrib-python'],
+	  install_requires=['numpy','tesseract_robotics>=0.2.0','opencv-contrib-python','aiohttp','importlib-resources'],
 	  long_description='Tesseract Robotics viewer package for Python'
      )

tesseract_viewer_python/tesseract_robotics_viewer/resources/static/app.js

@@ -72,11 +72,14 @@ class TesseractViewer {
         document.body.appendChild( renderer.domElement );
 
         const controls = new OrbitControls( camera, renderer.domElement );
-
+        
         // Only add VR button if it is supported
-        if (await navigator.xr.isSessionSupported( 'immersive-vr' ))
+        if ( 'xr' in navigator )
         {
-            document.body.appendChild( VRButton.createButton( renderer ) );
+            if (await navigator.xr.isSessionSupported( 'immersive-vr' ))
+            {
+                document.body.appendChild( VRButton.createButton( renderer ) );
+            }
         }
 
         renderer.setAnimationLoop( this.render.bind(this) );